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0' encoding='utf-8' > <configuration> <connectionStrings> <add name="MyCS" connectionString="Data Source='localhost';Initial Catalog='company'" /> </connectionStrings> </configuration> This defines a new connection string called MyCS From within your application, you can read the value of this connection string using the ConfigurationManager class:.

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typically the one the client is logged into initially will be the coordinator for the distributed transaction This one site will ask the other sites if they are ready to commit In effect, this site will go to the other sites and ask them to be prepared to commit Each of the other sites reports back its prepared state as YES or NO If any one of the sites votes NO, the entire transaction is rolled back If all sites vote YES, the site coordinator broadcasts a message to make the commit permanent on each of the sites This limits the window in which a serious error could occur Prior to the voting on the 2PC, any distributed error would result in all of the sites rolling back There would be no doubt as to the outcome of the transaction.

After the order to commit or rollback, there again is no doubt as to the outcome of the distributed transaction It is only during the very short window when the coordinator is collecting the votes that the outcome might be in doubt, after a failure Assume, for example, we have three sites participating in the transaction with Site 1 being the coordinator Site 1 has asked Site 2 to prepare to commit, and Site 2 has done so Site 1 then asks Site 3 to prepare to commit, and it does so At this point, Site 1 is the only site that knows the outcome of the transaction, and it is now responsible for broadcasting the outcome to the other sites If an error occurs right now the network fails, Site 1 loses power, whatever Sites 2 and 3 will be left hanging.

#r "System.Configuration.dll" open System.Configuration open System.Data.SqlClient let cs = ConfigurationManager.ConnectionStrings.Item("MyCS") let conn = new SqlConnection(cs.ConnectionString) For this to work, make sure you reference System.Configuration.dll in your project properties using the -r option, or use the #r directive in your code as above, because this DLL is not automatically included at compile time.

They will have what is known as an in-doubt distributed transaction The 2PC protocol attempts to close the window of error as much as possible, but it can t close it entirely Sites 2 and 3 must keep that transaction open, awaiting notification of the outcome from Site 1 If you recall from the architecture discussion in 5, Oracle Processes, it is the function of the RECO process to resolve this issue This is also where COMMIT and ROLLBACK with the FORCE option come into play If the cause of the problem was a network failure between Sites 1, 2, and 3, then the DBAs at Sites 2 and 3 could actually call the DBA at Site 1, ask him for the outcome, and apply the commit or rollback manually, as appropriate.

You can execute a simple SQL command to create a table; all you need is to specify its data fields and their types and whether null values are allowed. In the following example, we create an Employees table with a primary key EmpID and FirstName, LastName, and Birthday fields. execNonQuery conn "CREATE TABLE Employees ( EmpID int NOT NULL, FirstName varchar(50) NOT NULL, LastName varchar(50) NOT NULL, Birthday datetime, PRIMARY KEY (EmpID))" We can now insert two new records as follows: execNonQuery conn "INSERT INTO Employees (EmpId, FirstName, LastName, Birthday) VALUES (1001, 'Joe', 'Smith', '02/14/1965')" execNonQuery conn "INSERT INTO Employees (EmpId, FirstName, LastName, Birthday) VALUES (1002, 'Mary', 'Jones', '09/15/1985')" and retrieve two columns of what was inserted using a fresh connection and a data reader: let query() = seq { use conn = new SqlConnection(connString) do conn.Open() use comm = new SqlCommand("SELECT FirstName, Birthday FROM Employees", conn) use reader = comm.ExecuteReader() while reader.Read() do yield (reader.GetString 0, reader.GetDateTime 1) } When we evaluate the query expression in F# Interactive, a connection to the database is created and opened, the command is built, and the reader is used to read successive elements: